Lead-Acid Battery System And Lead-Acid Battery Life Estimation Method

Abstract

Described are a lead-acid battery system and a lead-acid battery life estimation method capable of accurately estimating a remaining life of a lead-acid battery by calculating a capacity turnover (CT) value during operation in consideration of at least one of an upper limit state of charge (SOC) or an upper limit voltage. A CT value calculation unit calculates the CT value during operation using at least one of an upper-limit-SOC-based correction coefficient (KHSOC) calculated based on the upper limit SOC, which is an SOC having the largest value when the lead-acid battery is charged, or an upper-limit-voltage-based correction coefficient (KHV) calculated based on the upper limit voltage, which is the highest voltage when the lead-acid battery is charged.

What is claimed is: 
     
         1 . A lead-acid battery system configured to estimate a remaining life of a lead-acid battery by comparing a capacity turnover value from a beginning to an end of life with a capacity turnover value during operation, the lead-acid battery system comprising:
 a capacity turnover value calculation unit configured to calculate the capacity turnover value during operation,   wherein the capacity turnover value calculation unit calculates the capacity turnover value during operation using at least one of:
 an upper-limit-state-of-charge-based correction coefficient calculated based on an upper limit state of charge (SOC) calculated by an upper limit SOC calculation unit configured to calculate the upper limit SOC, which is an SOC having a largest value when the lead-acid battery is charged, or 
 an upper-limit-voltage-based correction coefficient calculated based on an upper limit voltage calculated by an upper limit voltage calculation unit configured to calculate the upper limit voltage, which is a highest voltage when the lead-acid battery is charged. 
   
     
     
         2 . The lead-acid battery system according to  claim 1 , wherein the upper limit SOC calculation unit calculates, as the upper limit SOC, an SOC at a start of a discharge of the lead-acid battery, and the capacity turnover value calculation unit calculates the upper-limit-state-of-charge-based correction coefficient based on the upper limit SOC calculated by the upper limit SOC calculation unit. 
     
     
         3 . The lead-acid battery system according to  claim 1 , wherein the upper limit SOC calculation unit calculates, as the upper limit SOC, an SOC at an end of a next charge after an end of a discharge of the lead-acid battery, and the capacity turnover value calculation unit calculates the upper-limit-state-of-charge-based correction coefficient based on the upper limit SOC calculated by the upper limit SOC calculation unit. 
     
     
         4 . The lead-acid battery system according to  claim 1 , wherein the upper limit voltage calculation unit calculates, as the upper limit voltage, a peak voltage at an end of a charge immediately before a discharge of the lead-acid battery to be subjected to calculation of the capacity turnover value during operation, and the capacity turnover value calculation unit calculates the upper-limit-voltage-based correction coefficient based on the upper limit voltage calculated by the upper limit voltage calculation unit. 
     
     
         5 . The lead-acid battery system according to  claim 1 , wherein the upper limit voltage calculation unit calculates, as the upper limit voltage, a peak voltage at an end of a next charge after an end of a discharge of the lead-acid battery, and the capacity turnover value calculation unit calculates the upper-limit-voltage-based correction coefficient based on the upper limit voltage calculated by the upper limit voltage calculation unit. 
     
     
         6 . The lead-acid battery system according to  claim 1 , wherein the lead-acid battery is a bipolar lead-acid battery. 
     
     
         7 . A lead-acid battery life estimation method in which a remaining life of a lead-acid battery is estimated by comparing a capacity turnover value from a beginning to an end of life with a capacity turnover value during operation, the lead-acid battery life estimation method comprising:
 a capacity turnover value calculation step of calculating the capacity turnover value during operation,   wherein in the capacity turnover value calculation step, the capacity turnover value during operation is calculated using at least one of:   an upper-limit-state-of-charge-based correction coefficient calculated based on an upper limit state of charge (SOC) calculated in an upper limit SOC calculation step of calculating the upper limit SOC, which is an SOC having a largest value when the lead-acid battery is charged, or   an upper-limit-voltage-based correction coefficient calculated based on an upper limit voltage calculated in an upper limit voltage calculation step of calculating the upper limit voltage, which is a highest voltage when the lead-acid battery is charged.   
     
     
         8 . The lead-acid battery life estimation method according to  claim 7 , wherein in the upper limit SOC calculation step, an SOC at a start of a discharge of the lead-acid battery is calculated as the upper limit SOC, and in the capacity turnover value calculation step, the upper-limit-state-of-charge-based correction coefficient is calculated based on the upper limit SOC calculated in the upper limit SOC calculation step. 
     
     
         9 . The lead-acid battery life estimation method according to  claim 7 , wherein in the upper limit SOC calculation step, an SOC at an end of a next charge after an end of a discharge of the lead-acid battery is calculated as the upper limit SOC, and in the capacity turnover value calculation step, the upper-limit-state-of-charge-based correction coefficient is calculated based on the upper limit SOC calculated by the upper limit SOC calculation step. 
     
     
         10 . The lead-acid battery life estimation method according to  claim 7 , wherein in the upper limit voltage calculation step, a peak voltage at an end of a charge immediately before a discharge of the lead-acid battery is calculated as the upper limit voltage, and in the capacity turnover value calculation step, the upper-limit-voltage-based correction coefficient is calculated based on the upper limit voltage calculated in the upper limit voltage calculation step. 
     
     
         11 . The lead-acid battery life estimation method according to  claim 7 , wherein in the upper limit voltage calculation step, a peak voltage at an end of a next charge after an end of a discharge of the lead-acid battery is calculated as the upper limit voltage, and in the capacity turnover value calculation step, the upper-limit-voltage-based correction coefficient is calculated based on the upper limit voltage calculated in the upper limit voltage calculation step. 
     
     
         12 . The lead-acid battery life estimation method according to  claim 7 , wherein the lead-acid battery is a bipolar lead-acid battery. 
     
     
         13 . The lead-acid battery system according to  claim 2 , wherein the lead-acid battery is a bipolar lead-acid battery. 
     
     
         14 . The lead-acid battery system according to  claim 3 , wherein the lead-acid battery is a bipolar lead-acid battery. 
     
     
         15 . The lead-acid battery system according to  claim 4 , wherein the lead-acid battery is a bipolar lead-acid battery. 
     
     
         16 . The lead-acid battery system according to  claim 5 , wherein the lead-acid battery is a bipolar lead-acid battery. 
     
     
         17 . The lead-acid battery life estimation method according to  claim 8 , wherein the lead-acid battery is a bipolar lead-acid battery. 
     
     
         18 . The lead-acid battery life estimation method according to  claim 9 , wherein the lead-acid battery is a bipolar lead-acid battery. 
     
     
         19 . The lead-acid battery life estimation method according to  claim 10 , wherein the lead-acid battery is a bipolar lead-acid battery. 
     
     
         20 . The lead-acid battery life estimation method according to  claim 11 , wherein the lead-acid battery is a bipolar lead-acid battery.